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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const createHash = require("../util/createHash");
const { makePathsRelative } = require("../util/identifier");
const numberHash = require("../util/numberHash");
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../ChunkGraph")} ChunkGraph */
/** @typedef {import("../Compilation")} Compilation */
/** @typedef {import("../Module")} Module */
/**
* @param {string} str string to hash
* @param {number} len max length of the hash
* @returns {string} hash
*/
const getHash = (str, len) => {
const hash = createHash("md4");
hash.update(str);
const digest = /** @type {string} */ (hash.digest("hex"));
return digest.substr(0, len);
};
/**
* @param {string} str the string
* @returns {string} string prefixed by an underscore if it is a number
*/
const avoidNumber = str => {
// max length of a number is 21 chars, bigger numbers a written as "...e+xx"
if (str.length > 21) return str;
const firstChar = str.charCodeAt(0);
// skip everything that doesn't look like a number
// charCodes: "-": 45, "1": 49, "9": 57
if (firstChar < 49) {
if (firstChar !== 45) return str;
} else if (firstChar > 57) {
return str;
}
if (str === +str + "") {
return `_${str}`;
}
return str;
};
/**
* @param {string} request the request
* @returns {string} id representation
*/
const requestToId = request => {
return request
.replace(/^(\.\.?\/)+/, "")
.replace(/(^[.-]|[^a-zA-Z0-9_-])+/g, "_");
};
exports.requestToId = requestToId;
/**
* @param {string} string the string
* @param {string} delimiter separator for string and hash
* @returns {string} string with limited max length to 100 chars
*/
const shortenLongString = (string, delimiter) => {
if (string.length < 100) return string;
return (
string.slice(0, 100 - 6 - delimiter.length) + delimiter + getHash(string, 6)
);
};
/**
* @param {Module} module the module
* @param {string} context context directory
* @param {Object=} associatedObjectForCache an object to which the cache will be attached
* @returns {string} short module name
*/
const getShortModuleName = (module, context, associatedObjectForCache) => {
const libIdent = module.libIdent({ context, associatedObjectForCache });
if (libIdent) return avoidNumber(libIdent);
const nameForCondition = module.nameForCondition();
if (nameForCondition)
return avoidNumber(
makePathsRelative(context, nameForCondition, associatedObjectForCache)
);
return "";
};
exports.getShortModuleName = getShortModuleName;
/**
* @param {string} shortName the short name
* @param {Module} module the module
* @param {string} context context directory
* @param {Object=} associatedObjectForCache an object to which the cache will be attached
* @returns {string} long module name
*/
const getLongModuleName = (
shortName,
module,
context,
associatedObjectForCache
) => {
const fullName = getFullModuleName(module, context, associatedObjectForCache);
return `${shortName}?${getHash(fullName, 4)}`;
};
exports.getLongModuleName = getLongModuleName;
/**
* @param {Module} module the module
* @param {string} context context directory
* @param {Object=} associatedObjectForCache an object to which the cache will be attached
* @returns {string} full module name
*/
const getFullModuleName = (module, context, associatedObjectForCache) => {
return makePathsRelative(
context,
module.identifier(),
associatedObjectForCache
);
};
exports.getFullModuleName = getFullModuleName;
/**
* @param {Chunk} chunk the chunk
* @param {ChunkGraph} chunkGraph the chunk graph
* @param {string} context context directory
* @param {string} delimiter delimiter for names
* @param {Object=} associatedObjectForCache an object to which the cache will be attached
* @returns {string} short chunk name
*/
const getShortChunkName = (
chunk,
chunkGraph,
context,
delimiter,
associatedObjectForCache
) => {
const modules = chunkGraph.getChunkRootModules(chunk);
const shortModuleNames = modules.map(m =>
requestToId(getShortModuleName(m, context, associatedObjectForCache))
);
chunk.idNameHints.sort();
const chunkName = Array.from(chunk.idNameHints)
.concat(shortModuleNames)
.filter(Boolean)
.join(delimiter);
return shortenLongString(chunkName, delimiter);
};
exports.getShortChunkName = getShortChunkName;
/**
* @param {Chunk} chunk the chunk
* @param {ChunkGraph} chunkGraph the chunk graph
* @param {string} context context directory
* @param {string} delimiter delimiter for names
* @param {Object=} associatedObjectForCache an object to which the cache will be attached
* @returns {string} short chunk name
*/
const getLongChunkName = (
chunk,
chunkGraph,
context,
delimiter,
associatedObjectForCache
) => {
const modules = chunkGraph.getChunkRootModules(chunk);
const shortModuleNames = modules.map(m =>
requestToId(getShortModuleName(m, context, associatedObjectForCache))
);
const longModuleNames = modules.map(m =>
requestToId(getLongModuleName("", m, context, associatedObjectForCache))
);
chunk.idNameHints.sort();
const chunkName = Array.from(chunk.idNameHints)
.concat(shortModuleNames, longModuleNames)
.filter(Boolean)
.join(delimiter);
return shortenLongString(chunkName, delimiter);
};
exports.getLongChunkName = getLongChunkName;
/**
* @param {Chunk} chunk the chunk
* @param {ChunkGraph} chunkGraph the chunk graph
* @param {string} context context directory
* @param {Object=} associatedObjectForCache an object to which the cache will be attached
* @returns {string} full chunk name
*/
const getFullChunkName = (
chunk,
chunkGraph,
context,
associatedObjectForCache
) => {
if (chunk.name) return chunk.name;
const modules = chunkGraph.getChunkRootModules(chunk);
const fullModuleNames = modules.map(m =>
makePathsRelative(context, m.identifier(), associatedObjectForCache)
);
return fullModuleNames.join();
};
exports.getFullChunkName = getFullChunkName;
/**
* @template K
* @template V
* @param {Map<K, V[]>} map a map from key to values
* @param {K} key key
* @param {V} value value
* @returns {void}
*/
const addToMapOfItems = (map, key, value) => {
let array = map.get(key);
if (array === undefined) {
array = [];
map.set(key, array);
}
array.push(value);
};
/**
* @param {Compilation} compilation the compilation
* @returns {Set<string>} used module ids as strings
*/
const getUsedModuleIds = compilation => {
const chunkGraph = compilation.chunkGraph;
/** @type {Set<string>} */
const usedIds = new Set();
if (compilation.usedModuleIds) {
for (const id of compilation.usedModuleIds) {
usedIds.add(id + "");
}
}
for (const module of compilation.modules) {
const moduleId = chunkGraph.getModuleId(module);
if (moduleId !== null) {
usedIds.add(moduleId + "");
}
}
return usedIds;
};
exports.getUsedModuleIds = getUsedModuleIds;
/**
* @param {Compilation} compilation the compilation
* @returns {Set<string>} used chunk ids as strings
*/
const getUsedChunkIds = compilation => {
/** @type {Set<string>} */
const usedIds = new Set();
if (compilation.usedChunkIds) {
for (const id of compilation.usedChunkIds) {
usedIds.add(id + "");
}
}
for (const chunk of compilation.chunks) {
const chunkId = chunk.id;
if (chunkId !== null) {
usedIds.add(chunkId + "");
}
}
return usedIds;
};
exports.getUsedChunkIds = getUsedChunkIds;
/**
* @template T
* @param {Iterable<T>} items list of items to be named
* @param {function(T): string} getShortName get a short name for an item
* @param {function(T, string): string} getLongName get a long name for an item
* @param {function(T, T): -1|0|1} comparator order of items
* @param {Set<string>} usedIds already used ids, will not be assigned
* @param {function(T, string): void} assignName assign a name to an item
* @returns {T[]} list of items without a name
*/
const assignNames = (
items,
getShortName,
getLongName,
comparator,
usedIds,
assignName
) => {
/** @type {Map<string, T[]>} */
const nameToItems = new Map();
for (const item of items) {
const name = getShortName(item);
addToMapOfItems(nameToItems, name, item);
}
/** @type {Map<string, T[]>} */
const nameToItems2 = new Map();
for (const [name, items] of nameToItems) {
if (items.length > 1 || !name) {
for (const item of items) {
const longName = getLongName(item, name);
addToMapOfItems(nameToItems2, longName, item);
}
} else {
addToMapOfItems(nameToItems2, name, items[0]);
}
}
/** @type {T[]} */
const unnamedItems = [];
for (const [name, items] of nameToItems2) {
if (!name) {
for (const item of items) {
unnamedItems.push(item);
}
} else if (items.length === 1 && !usedIds.has(name)) {
assignName(items[0], name);
usedIds.add(name);
} else {
items.sort(comparator);
let i = 0;
for (const item of items) {
while (nameToItems2.has(name + i) && usedIds.has(name + i)) i++;
assignName(item, name + i);
usedIds.add(name + i);
i++;
}
}
}
unnamedItems.sort(comparator);
return unnamedItems;
};
exports.assignNames = assignNames;
/**
* @template T
* @param {T[]} items list of items to be named
* @param {function(T): string} getName get a name for an item
* @param {function(T, T): -1|0|1} comparator order of items
* @param {function(T, number): boolean} assignId assign an id to an item
* @param {number[]} ranges usable ranges for ids
* @param {number} expandFactor factor to create more ranges
* @param {number} extraSpace extra space to allocate, i. e. when some ids are already used
* @returns {void}
*/
const assignDeterministicIds = (
items,
getName,
comparator,
assignId,
ranges = [10],
expandFactor = 10,
extraSpace = 0
) => {
items.sort(comparator);
// max 5% fill rate
const optimalRange = Math.min(
Math.ceil(items.length * 20) + extraSpace,
Number.MAX_SAFE_INTEGER
);
let i = 0;
let range = ranges[i];
while (range < optimalRange) {
i++;
if (i < ranges.length) {
range = Math.min(ranges[i], Number.MAX_SAFE_INTEGER);
} else {
range = Math.min(range * expandFactor, Number.MAX_SAFE_INTEGER);
}
}
for (const item of items) {
const ident = getName(item);
let id;
let i = 0;
do {
id = numberHash(ident + i++, range);
} while (!assignId(item, id));
}
};
exports.assignDeterministicIds = assignDeterministicIds;
/**
* @param {Iterable<Module>} modules the modules
* @param {Compilation} compilation the compilation
* @returns {void}
*/
const assignAscendingModuleIds = (modules, compilation) => {
const chunkGraph = compilation.chunkGraph;
const usedIds = getUsedModuleIds(compilation);
let nextId = 0;
let assignId;
if (usedIds.size > 0) {
assignId = module => {
if (chunkGraph.getModuleId(module) === null) {
while (usedIds.has(nextId + "")) nextId++;
chunkGraph.setModuleId(module, nextId++);
}
};
} else {
assignId = module => {
if (chunkGraph.getModuleId(module) === null) {
chunkGraph.setModuleId(module, nextId++);
}
};
}
for (const module of modules) {
assignId(module);
}
};
exports.assignAscendingModuleIds = assignAscendingModuleIds;
/**
* @param {Iterable<Chunk>} chunks the chunks
* @param {Compilation} compilation the compilation
* @returns {void}
*/
const assignAscendingChunkIds = (chunks, compilation) => {
const usedIds = getUsedChunkIds(compilation);
let nextId = 0;
if (usedIds.size > 0) {
for (const chunk of chunks) {
if (chunk.id === null) {
while (usedIds.has(nextId + "")) nextId++;
chunk.id = nextId;
chunk.ids = [nextId];
nextId++;
}
}
} else {
for (const chunk of chunks) {
if (chunk.id === null) {
chunk.id = nextId;
chunk.ids = [nextId];
nextId++;
}
}
}
};
exports.assignAscendingChunkIds = assignAscendingChunkIds;